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After making some changes to my sources, NB started scanning (using lots of CPU) and never finished. Navigator window showed always "scanning..." and the IDE was not able to shut down. Using NB 5.5 Beta with EE pack, JDK 5.0_06. Attaching exceptions from the log and threaddump from the hang during shutdown.
Created attachment 30886 [details] ThreadDump
Created attachment 30887 [details] Exceptions
I should add that I did not get the scanning progress bar like after start. It was just the background scanning that takes sometimes place after changing sources.
I don't see scanning in the thread dump. Anyway some exception were already fixed issue 75032. Rest of exceptions are covered by issue 78916. *** This issue has been marked as a duplicate of 78916 ***
Reorganization of java component